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CAS RN: 10513-45-8 | Product Number: B0832

N-tert-Butyl-5-methylisoxazolium Perchlorate


Purity: >98.0%(HPLC)(N)
Synonyms:
  • Woodward's Reagent L
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Product Number B0832
Purity / Analysis Method >98.0%(HPLC)(N)
Molecular Formula / Molecular Weight C__8H__1__4ClNO__5 = 239.65  
Physical State (20 deg.C) Solid
CAS RN 10513-45-8
Reaxys Registry Number 5202574
PubChem Substance ID 87563816
SDBS (AIST Spectral DB) 10455
MDL Number

MFCD00011960

Specifications
Appearance White to Light yellow to Light red powder to crystal
Purity(HPLC) min. 98.0 area%
Purity(with Total Nitrogen) min. 98.0 %
Melting point 119.0 to 122.0 °C
Properties (reference)
Melting Point 119 °C
GHS
Pictogram Pictogram
Signal Word Warning
Hazard Statements H272 : May intensify fire
Precautionary Statements P501 : Dispose of contents/ container to an approved waste disposal plant.
P220 : Keep/Store away from clothing/ combustible materials.
P210 : Keep away from heat.
P221 : Take any precaution to avoid mixing with combustibles.
P280 : Wear protective gloves/ eye protection/ face protection.
P370 + P378 : In case of fire: Use dry sand, dry chemical or alcohol-resistant foam to extinguish.
Related Laws:
Fire Defense Law Group-1-III
Transport Information:
UN Number UN1479
Class 5.1
Packing Group III
Application
Woodward’s Reagent L: A Condensing Agent

B0832

Experimental procedure1):
Under nitrogen, N-tert-butyl-5-methylisoxazolium perchlorate (240 mg, 1 mmol) is added to a mixture of 3-quinoline carboxylic acid (173 mg, 1 mmol) and triethylamine (140 µL, 1 mmol) in DMF (2 mL). The mixture is stirred at room temperature for 4 h and then poured on iced water (50 mL). The precipitate is collected, washed with water and dried. The intermediate ester 1 (131 mg, 0.44 mmol) is isolated in 44% yield as a yellow powder. Then the product (110 mg, 0.36 mmol) in DMF (3 mL) is added to a freshly prepared guanidine 2 (123 mg, 0.39 mmol) and the mixture is stirred at 140 °C for 2 h. The solvent is evaporated under reduced pressure. Water (10 mL) is added to the residue, and after 12 h at 4 °C, the precipitate formed is filtered, washed with water, and dried to obtain compound 3 in 85% yield.

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